XML 85 R49.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Fair Value Measurements - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Fair Value Measurements [Line Items] |  |
Fair Value, Equity, Level 1 to Level 2 Transfers, Amount | $ 0 | $ 0
Fair Value, Equity, Level 2 to Level 1 Transfers, Amount | $ 0 | $ 0

X
- Definition Fair Value Assets Level One To Level Two Transfer Amount + References No definition available. + Details
Name: | vrts_FairValueAssetsLevelOneToLevelTwoTransferAmount
Namespace Prefix: | vrts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fair Value Assets Level Two To Level One Transfer Amount + References No definition available. + Details
Name: | vrts_FairValueAssetsLevelTwoToLevelOneTransferAmount
Namespace Prefix: | vrts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | vrts_FairValueMeasurementsLineItems
Namespace Prefix: | vrts_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration